The National Weather Service has issued an urban and small stream flood advisory for poor drainage areas in southern Guam until 9:30 p.m.

A flood advisory means river or stream flows are elevated or ponding of water in urban or other areas is occurring or is imminent, according to a Weather Service news release.

Heavy rain will cause urban and small stream flooding in the south, the Weather Service reported. Some locations that will experience flooding include:

Talofofo;

Inarajan;

Merizo;

Santa Rita; and

Umatac.

Residents and visitors are advised:

Turn around when encountering flooded roads. Most flood deaths occur in vehicles.

Be especially cautious when it's harder to recognize the dangers of flooding, especially in areas lacking light.

The release also stated that a high surf advisory remains in effect for Guam, Rota, Tinian and Saipan until 6 p.m. Saturday. Hazardous surf of 7 to 9 feet is expected along west facing reefs through tonight, and the surf will rise between 8 and 10 feet Friday night through Saturday night.

The Weather Service advises people to avoid venturing near reefs and beaches, especially those facing west. Large breaking waves can knock you down and cause serious injuries. Strong rip currents will be life threatening.